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Mollusks and Segmented Worms Body Structure of Mollusks Mollusks are ______________________ animals with bilateral symmetry, a soft internal body, a digestive tract with two openings, a muscular foot, and a ______________________. Feeding and Digestion A ______________________ scrapes food into their mouths. Mollusks have complete guts with digestive glands, stomachs, and intestines. Respiration ______________________ are parts of the mantle. Gills contain a rich supply of blood for the transport of oxygen to the blood and for the removal of carbon dioxide from the blood. Circulation In an ______________________ circulatory system, blood is pumped out of vessels into open spaces surrounding the body organs. Oxygen and nutrients diffuse into tissues that are bathed in blood and carbon dioxide diffuses from tissues into the blood. In a ______________________ circulatory system, blood is confined to vessels as it moves through the body. A closed system ______________________ transports oxygen and nutrients to cells where they are converted to usable forms of energy. Excretion Mollusks get rid of metabolic wastes from cellular processes through structures called ______________________. Response to Stimuli Nervous systems coordinate their movements and behavior. Reproduction Mollusks reproduce ______________________. All mollusks share similar developmental patterns. Diversity of Mollusks Gastropods The largest class of mollusks is Gastropoda. Most species of gastropods have a ______________________. Abalones, snails, conches, periwinkles, limpets, cowries, whelks, and cones Slugs and nudibranchs do not have shells. Bivalves Bivalves are ______________________ mollusks. Clams, mussels, oysters, and scallops Use a muscular foot to burrow into wet sand Cephalopods Cephalopods are the head-footed mollusks. Squid, octopus, chambered nautilus, and the cuttlefish The foot of a cephalopod is divided into arms and tentacles with suckers. Cephalopod Protection Expel ______________________ to propel themselves away from threat Shoot out an ______________________ substance that forms a cloud Change color to blend in with their surroundings Mollusks and Segmented Worms Body Structure of Segmented Worms Annelids undergo ______________________ development. Include earthworms, marine worms, and parasitic leeches ______________________ and have a ______________________ Segmentation also permits segments to move ______________________ of each other and enables a worm to survive damage. Segments can be ______________________. Feeding and Digestion Running through all earthworm segments from the mouth to the anus is the ______________________. Circulation Most annelids have a ______________________ circulatory system. Respiration and Excretion Earthworms take in oxygen and give off carbon dioxide through their ______________________. Aquatic annelids have ______________________ for the exchange of gases in the water. Segmented worms have two ______________________ in almost every segment. Movement The earthworm contracts circular muscles running around each segment. This squeezes the segment and causes the fluid in the coelom to press outward like paste. The fluid pressure causes the segment to get longer and thinner. Reproduction Reproduce both sexually and asexually